I'm not suggesting you are saying that, but I am saying it. If the person can use their strength to pick you up with one arm when you are doing ikkyo, then there is something wrong with your ikkyo. I'm not very big myself and it has happened to me many times. It was a good learning experience, and improved my ikkyo a lot.

Yes, exactly. My point being that (a) strength creates opportunities that are not available to smaller people and (b) facing a stronger partner raises the level of skill that you must have in order to execute a technique successfully.